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<head>
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  <title>Document</title>
  <style>
    /* 清除标签默认的margin和padding */
    * {
      margin: 0;
      padding: 0;
    }

    .box {
      /* 不设置宽度，块级元素默认会占满一行 */
      height: 40px;
      /* background-color: skyblue; */
      border-top: 3px solid #ff8500;
      border-bottom: 1px solid #edeef0;
    }

    .box a {
      /* 转换行内块 */
      display: inline-block;
      width: 80px;
      height: 40px;
      /* background-color: pink; */
      color: #4c4c4c;
      text-decoration: none;
      text-align: center;
      line-height: 40px;
      font-size: 12px;
    }

    .box a:hover {
      background-color: #edeef0;
      color: #ff8400;
    }
  </style>
</head>
<body>
  <div class="box">
    <a href="#">新浪导航</a><a href="#">新浪导航</a><a href="#">新浪导航</a><a href="#">新浪导航</a>
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</body>
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